gsd:add-backlog

Imported from davepoon/buildwithclaude (plugins/gsd/skills/add-backlog/SKILL.md). Install upstream with npx skills add davepoon/buildwithclaude --skill add-backlog. Copyright stays with the author.

1. Read ROADMAP.md to find existing backlog entries:

   cat .planning/ROADMAP.md

2. Find next backlog number:

   NEXT=$(gsd-sdk query phase.next-decimal 999 --raw)

   If no 999.x phases exist, start at 999.1.

3. Add to ROADMAP.md under a ## Backlog section. If the section doesn't exist, create it at the end. Write the ROADMAP entry BEFORE creating the directory — this ensures directory existence is always a reliable indicator that the phase is already registered, which prevents false duplicate detection in any hook that checks for existing 999.x directories (#2280):

   ## Backlog
   
   ### Phase {NEXT}: {description} (BACKLOG)
   
   **Goal:** [Captured for future planning]
   **Requirements:** TBD
   **Plans:** 0 plans
   
   Plans:
   - [ ] TBD (promote with /gsd:review-backlog when ready)

4. Create the phase directory:

   SLUG=$(gsd-sdk query generate-slug "$ARGUMENTS" --raw)
   mkdir -p ".planning/phases/${NEXT}-${SLUG}"
   touch ".planning/phases/${NEXT}-${SLUG}/.gitkeep"

5. Commit:

   gsd-sdk query commit "docs: add backlog item ${NEXT} — ${ARGUMENTS}" .planning/ROADMAP.md ".planning/phases/${NEXT}-${SLUG}/.gitkeep"

6. Report:

   ## 📋 Backlog Item Added
   
   Phase {NEXT}: {description}
   Directory: .planning/phases/{NEXT}-{slug}/
   
   This item lives in the backlog parking lot.
   Use /gsd:discuss-phase {NEXT} to explore it further.
   Use /gsd:review-backlog to promote items to active milestone.